verb (used without object), collided, colliding.
to strike one another or one against the other with a forceful impact; come into violent contact; crash: The two cars collided with an ear-splitting crash.
to clash; conflict: Their views on the matter collided.
verb (used with object), collided, colliding.
to cause to collide: drivers colliding their cars in a demolition derby.

1615–25; < Latin collīdere to strike together, equivalent to col- col-1 + -līdere, combining form of laedere to strike

1. hit, smash, clash. Unabridged
Based on the Random House Dictionary, © Random House, Inc. 2014.
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World English Dictionary
collide (kəˈlaɪd)
1.  to crash together with a violent impact
2.  to conflict in attitude, opinion, or desire; clash; disagree
[C17: from Latin collīdere to clash together, from com- together + laedere to strike, wound]

Collins English Dictionary - Complete & Unabridged 10th Edition
2009 © William Collins Sons & Co. Ltd. 1979, 1986 © HarperCollins
Publishers 1998, 2000, 2003, 2005, 2006, 2007, 2009
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Word Origin & History

1621, from L. collidere "strike together," from com- "together" + lædere "to strike, injure by striking," of unknown origin. For L. vowel change, see acquisition.
Online Etymology Dictionary, © 2010 Douglas Harper
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Example sentences
As the four streams collide they are forced into a third channel, forming
  layered droplets as they go.
And we're gonna watch them collide for an entire season.
One is for cosmic rays to collide with stray atoms in interstellar space,
  producing a shower of particles.
Sometimes these clusters collide and merge with one another.
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